What should I do if the water pressure has dropped in my boiler?

Question

If the water pressure has dropped in my boiler, how much might this cost to have fixed? Is it an easy job and might it be a sign of a bigger issue? Thanks.

Kany · Accepted Answer

Record how often this is occurring. If it's every day you're having to top up, get an engineer to attend as this could be a fault in the boiler.

Denis · Answer

If this happens often it usually means you have a leak somewhere. This leak has to be fixed. Otherwise, you can repressurize your boiler by using the filling loop on your system.  The price will depend on the work required.

Alan · Answer

3 things cause pressure to drop
1. leaking radiator near valves
2. Leak in the system
3 Pressure relive valve is failing.  You will know by looking outside for a copper 15mm pipe with water coming out or staining on a wall.

You will need an engineer. Price about £100 top end.

Steven · Answer

Happens around 3-4 times a year naturally, if you top up a few times not to worry

if you top up every day or every few there could be a leak

cost depends on what kind if on boiler system would be an hourly rate + bottle of sealant with a plumber

if its leaking from the boiler it could be a prv let by which is 70/80 to fix or if the secondary plate it could potentially be 150-200

Mohammad · Answer

If water pressure keeps losing and there is no sign of leaking. Need to replace Expansion Vessel  and PRV

Mohammed · Answer

Hi Adam 
You need to pressurise it by using the filling loop on your boiler. Make sure you keep an eye on your pressure gauge on the boiler keep the pressure up to 1 bar or just above. It’s not a big issue if it’s the first time if it keeps dropping on a regular base then you have an issue call a gas safe engineer to rectify the problem.

Sean · Answer

A pressure drop could be a number of things
1 you have a leak
2 the pressure relief valve has failed
3 the expansion vessel on the system has failed.
You would need to get an engineer in to identify the problem

Omar · Answer

Hi Adam. You need to top it up from the filling loop underneath the boiler to 1.2bar. If still losing pressure every other day while using the heating. You need to seek a heating engineer

Tim · Answer

Top the pressure up to 1.5 bar when the boiler is cold.

What should I do if the water pressure has dropped in my boiler?

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